1. Suppose that instead of the Lambertian BRDF we used a BRDF of the form C cosa θi. What must C be to conserve energy?
2. The BRDF in Exercise 1 is not reciprocal. Can you modify it to be reciprocal?
Exercise 1
Suppose that instead of the Lambertian BRDF we used a BRDF of the form C cosa θi. What must C be to conserve energy?